Tsunayoshi Sawada is just an ordinary school kid, when one day he gets a home tutor, Reborn who, to Tsuna's suprise, is only an infant. He has come from Italy to teach Tsuna on how to be the Tenth Generation Vongola Family boss. Along the way he recruits Gokudera Hayato and Yamamoto Takeshi. Throughout most of the anime he refuses to be the new Vongola boss, but things change and with it, so do his motives.